// -----------------------------------------------------------------------------
// This source file is part of Matrix Platform
// 	(Universal .NET Software Development Platform)
// For the latest info, see http://www.matrixplatform.com
// 
// Copyright (c) 2009-2010, Ingenious Ltd
// 
// Permission is hereby granted, free of charge, to any person obtaining a copy
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// copies of the Software, and to permit persons to whom the Software is
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using System.Threading;
using Matrix.Framework.MessageBus.Core;

namespace Matrix.Framework.MessageBus.Clients.ExecutionStrategies
{
    /// <summary>
    /// Implementation of the execution strategy using the default .net framework thread pool.
    /// </summary>
    public class FrameworkThreadPoolExecutionStrategy : ExecutionStrategy
    {
        WaitCallback _waitCallback;

        /// <summary>
        /// Constructor.
        /// </summary>
        public FrameworkThreadPoolExecutionStrategy()
        {
            _waitCallback = new WaitCallback(WaitCallbackFunc);
        }

        public override void Dispose()
        {
            _waitCallback = null;
            base.Dispose();
        }

        /// <summary>
        /// Enlist item for execution.
        /// </summary>
        protected override void OnExecute(Envelope envelope)
        {
            WaitCallback waitCallback = _waitCallback;
            if (waitCallback != null)
            {
                ThreadPool.QueueUserWorkItem(waitCallback, envelope);
            }
        }
        
        /// <summary>
        /// Execute item.
        /// </summary>
        protected void WaitCallbackFunc(object parameter)
        {
            ActiveClient client = Client;
            if (client != null)
            {
                client.PerformExecution(parameter as Envelope);
            }
        }

    }
}
